Impossible fork : Optical Illusions and Puzzle Pictures

Are there three prongs or just two on this impossible fork? A new version of a classic illusion

Impossible fork Small Poster £12.00	Impossible fork Large Framed Print £28.00	Impossible fork Greeting Cards (Pk of 10) £12.50
Impossible fork Framed Panel Print £28.00	Impossible fork Mini Poster Print £5.50	Impossible fork Greeting Card £3.00
Impossible fork Greeting Cards (Pk of 20) £20.50	Impossible fork Mousepad £9.50	Impossible fork Throw Pillow £14.00
Impossible fork Apron (dark) £16.50	Impossible fork Yard Sign £13.50	Impossible fork Tote Bag £11.00
Impossible fork Messenger Bag £16.50	Impossible fork Gym Bag £11.50	Impossible fork Beach Tote £17.00
Impossible fork Sweatshirt £25.00	Impossible fork Long Sleeve T-Shirt £16.50	Impossible fork Hooded Sweatshirt £29.00
Impossible fork Baseball Jersey £15.00	Impossible fork Jr. Raglan £15.00	Impossible fork Women's Long Sleeve T-Shirt £17.00
Impossible fork White T-Shirt £13.50	Impossible fork Jr. Jersey T-Shirt £17.00	Impossible fork Light T-Shirt £13.50
Impossible fork Golf Shirt £15.50	Impossible fork Women's T-Shirt £14.00	Impossible fork Jr. Spaghetti Tank £15.00
Impossible fork Fitted T-Shirt £15.00	Impossible fork Women's Light T-Shirt £14.00	Impossible fork Organic Men's Fitted T-Shirt £18.00
Impossible fork Value T-shirt £9.50	Impossible fork Jr. Ringer T-Shirt £15.50	Impossible fork Women's Tank Top £13.50
Impossible fork Men's Sleeveless Tee £13.50	Impossible fork Ringer T £13.50	Impossible fork Women's Cap Sleeve T-Shirt £14.00
Impossible fork Women's V-Neck T-Shirt £13.50	Impossible fork Women's Plus Size Scoop Neck T-Shi £20.50	Impossible fork Women's Plus Size V-Neck T-Shirt £20.50
Impossible fork Maternity T-Shirt £21.50	Impossible fork Organic Men's T-Shirt £19.50	Impossible fork Organic Women's T-Shirt £19.50
Impossible fork Organic Women's Fitted T-Shirt £18.00